Plaster board and method of making same



Oct. 8, 1929. c. w. UTZMAN PLASTER BOARD AND METHOD OF MAKING SAME 2 Sheets-Sheet Filed June 14. 1921 of) lfluemio; ('Za rencc (Z/g 351;; 111 Mme/1 a PM W M W; M A

Oct. 8, 1929. -c.'w. UTZMAN PLASTER BOARD AND METHOD OF MAKING SAME Filed June 14; 1921: 2 Sheets-Sheet 2 Elvwewtoz [Yarencc W? 351311 IQMDWWS PM M mm";

Patented Oct. 8, 1929 UNITED STATES PATENT OFFICE FLARENCE W. UTZMAN, 0F BUFFALO, NEW YORK, ASSIGNOR, BY MESNE ASSIGN- MENTS, T0 UNITED STATES GYPSUM COMPANY PLASTER BOARD AND METHOD OF MAKING SAME Application filed June 14, 1921.

My invention is an improvement in fabricated boards, and relates to that type of board having a plaster body, with facing sheets of fibrous material, and with protected edges, and the invention relates particularly to such edge protection.

In the construction of fabricated board, consisting of a plaster body and facing sheets of fibrous material, it is desirable that some protection, in the way of a fibrous covering, be provided for the side edges of the board, to prevent breaking and crumbling of the edges from handling, as for instance during transportation. It is desirable that such protection be of such nature, and so arranged, that the side edges of the board will be plane, and perpendicular to the faces of the board, and that the protection does not mar the board faces, nor detract in any manner from their sightly appearance. g

It has been proposed to provide such protection by turning the extended edges of one facing sheet over upon the other, but with this procedure, the twofaces of the board are not alike, and but one face is suitable for display, the appearance of the other face being marred by the overturned edges.

Should the display face he scratched or torn, or otherwise injured, the board mustbe rejected. Any procedure which involves the use of an edging strip engaging outside the facing sheets is open to the same objection since the overturned edges of the strip detract from the sightly appearance of the faces of the board. I

The object of the present invention is to provide a board, and a method of makin the same, wherein the side edges of the boar willbe protected, but in such manner that the said edges will be plane, and perpendicular to the faces of the board, and such faces will be alike and unmarred, so that either may be displayed in the erection of the boards.

In the drawings;

Figures 1 and 2 taken together show diagrammatically a form of apparatus for making the improved board, with Figs. 1, 1", 2, 2, 2, and 2 representing sections of the board taken on the lines indicated by the respective exponents.

Serial No. 477,371.

Figures 3 and 4 are partial transverse sections showing different embodiments of the improved board.

The board forming thesubject-matter of the present invention is composed of a body of plaster, having facing sheets of fibrous material, as for instance paper of suitable weight. The paper designed to form the facing sheets, indicated at 1 and 2 is mounted upon reels 3, which are arranged with their axes'parallel and in vertical alinement as shown, and so spaced that the webs 1 and 2 may travel parallel in spaced relation as shown in Figure l. Preferably two sets of reels 3 are provided, either set .of which may be used, so that when the paper is exhausted from a set of reels, they may be removed td be refilled, while the other set is being used. From the reels the paper passes through paper guides 4, the said guides engaging the edges of the webs to even said edges. Beyond the guides is arranged a pair of screen decks indicated at 5 and 6 respectively, over which the webs pass, and these screens are arranged within a nozzle 7 at the loweigend of a pipe 8, through which may be'supplied live steam. A pair of steam drums 9 is arranged beyond the nozzle 7, and the webs are-guidcdoutwardly around these drums, by means of direction elements 10 and guards ll the direction elements being rolls, as shown. From the drums 9 the webs pass inwardly over rollers 12, with which cooperate slitting discs 13 for trimming the edges of the webs. It will be noticed that a pair of slitting discs cooperates with each web, and the discs are mounted on frames 14 which are pivoted and engaged by springs 15 in a manner to yieldingly press the trimming discs toward the rollers 12. As shown at the right of Figure 1, the trimming discs 13 trim the edges of the web, the trimmed portion being indicated at 16.

The webs now pass outwardly over rollers. 17, and thence inwardly through scoring devices indicated generally at 18, which cut or crease each web near the opposite side edges thereof. The creases or scores indicated at I 19 are spaced apart from the edge-of the web of the board. The arrangement is such that when the board is completed so far as concerns the body and the facing sheets, the score lines 19 will be at the side edges of the body, and when the portions of the side edges outside the score lines are bent toward the opposite sheet, the free edges of the said portions of the two sheets will abut. Beyond the scoring devices, the upper sheet 1 passes abruptly outward away from the sheet 2, through a guide 20 and over a direction element 21 in the form of a roller. For some distance the sheet 1 now travels parallel with the sheet 2, but spaced apart from the same a relatively great distance. The sheet 1 is so spaced from the sheet 2, in order that edging strips may be attached to the sheet 2, and that the plaster body may be placed on the said sheet.

The edging strips 22 are mounted on reels 23, a set of reels being arranged at each side of the sheet 2, and each set consists of two reels, so that while one is being filled the operation of forming the board need not be discontinued. These strips 22 which are of a suit-able width and weight are passed over adhesive applying rollers 24, which receive adhesive, preferably casein adhesive from a container 25. A roller 26 dips into the adhesive in the container, and applies the same to the roller 24., by means of an intervening roller 27. After leaving the roller 24;, the strips are applied to the side edges of the facing sheet 2, on the scored face, by means of pressing rollers 28. These strips 22 are of such width that they will extend from well within the score lines 19 to and beyond the free edge of the facing sheet, a distance corresponding to approximately the thickness of the body of the board; As shown more particularly in Figure 3, thej arrangement, and the relative proportions of the parts are such that when the facing sheets are in place and the extended edges of the said sheets are bent to abut with each other across the side edges of the board, the edging sheet will be inside said abutting edges, and will abut with its free edge the near face of the opposite facing sheet 1. Thatis the edging strips are so spaced that they extend beyond the free edges of the web to a distance substantially equal to the thickness of the board body.

After leaving the pressing rollers 28, the edges of the web 2 are turned up as indicated at the left of Figure 2, to a position at substantially right angles to the body of the sheet. Thus the portions of the edging strips extending beyond the score lines 19 are turned up with the edges of the facing sheet, and if desired the edging strips may be cut or creased on the line along which they will be bent prior to their attachment to the web 2. After the edges are turned up as above mentioned, the plaster body 29 is placed up on the web 2, between the upturned edges,

by means of anendless conveyor indicated generally at 30. Guards 31 are arranged at the opposite sides of the web, to hold the body material in place. After the body has been placed, the web 1 is brought down over a direction element 32, and applied to the upper face of the body, as indicated at the right and top of Figure 2. The scores 19 in the web 1 are so spaced, that when the Web 1 is properly applied upon the body, the said score lines will be at the outer face of the edging strips 22. That is the score lines 19 of the web 1 are spaced in the same manner as the score lines of the web 2. The edges of the WBb2 are turned up by a suitable plow 33, and the extended edges of the web 1 are turned down upon the side edges of the body, and upon the edging strips 22, by means of suitable plows 34. The adhesive is applied to the full width of that face ofeach edging strip which is adjacent to the web 2, so that when the extended edges of the webs 1 and 2 are turned over into abutting relation, upon the edging strips 22, they will adhere to such edging strips. Thus there will be formed a board having protective side edges, which will prevent crumbling and breaking of the board, andwherein both faces of the board are alike, so that either may be the display face of an erected wall. It will be noticed referring to Figure 3 that there are two thicknesses of fibrous material at each side edge of the completed board, namely a thickness of edging strip and one of facing sheet. The strips 22 are of such width that they reinforce the side edges of the board, acting as nailing strips, as will be evident from an inspection of Figure 3. The arrangement is such that the side edges of the board are plane, and perpendicular to the opposite faces.

In Figure 4; a board is shown of the character forming the subject-matter of my prior application, Serial No. 374,833, filed April 19, 1920, Patent No. 1,638,280, Aug. 9, 1927. Thi type of board has depressions at its opposite sideedges on one face, extending to the said side edges, the arrangement being such that When the boards are erected, the wall will have parallel grooves or gutters, which may be filled with plaster or the like. The i111- proved board comprises a body 38 and facing sheets 35 and 36. The edging strips 37 are arranged in the same manner as the strips shown in Figure 3, being secured to the lower facing sheet 36, and it will be understood that the sheets 35 and 36are scored in the same manner as the sheets 1 and 2. The method of forming the board is precisely the same as in that of Figure 3. In order to insure additional reinforcement at the alined edges of the board however, the inturned edges of the facing sheets are lapped upon each other instead of abutted, thus providing three thicknesses of fibrous material at the side edges.

I claim.

1. The method of protecting and reinforcing the side/edges of fabricated board composed of a plaster body and facing sheets of fibrous material, which includes separately turning over the side edges of the sheets upon posed of a plaster body and facing sheets of fibrous material, which includes connecting edging strips to the inner face of one sheet at the side edges thereof and separately bending the edges of the said sheets toward each other across the side edges of the board, and in securing the said edges to the edging strips with the edging strips inward.

3. The method of protecting and reinforcing the side edges of fabricated board com posed of a plaster body and facing sheets of fibrous material, which includes scoring the said sheets near the side edges thereof to provide bending lines, securing edging strips to the inner face of one sheet at the side edges thereof and separately bending the edges of the said sheets on the score lines at substantially right angles to the sheets across the side edges of the board and in securing the said edges to the edging strips.

4. The methodof making fabricated boardcomposed of a plaster body and fibrous facing sheets, which comprises scoring the facing sheets near each side edge to provide a bending crease, securing edging strips to one of the sheets on the scored face at the side edges thereof and extending beyond said edges,

bending up the scored edges and the strips of the said sheet, placing the plaster body thereon, placing upon the body the other faciiig sheet, bending down the scored edges thereof to abut the bent edgesof the other sheet, and securing said edges to'the edging strips. I

y 5. A fabricated board composed of a plas" ter body and facing strips of fibrous material, having the side edges thereof bent into abutting relation across the side edges of the board, and edging strips secured to the inner faces of the said bent edges and to the body of one sheet.

6. A fabricated board composed of a, plascover sheetswider than the intended width of the board, placing a separate edging strip Within the board adjacent to the edge of the plaster body, and then folding the margins of the cover sheet over the strip and the ends of the board.

8. The methodof making protected-edge plaster board, which includes providing cover sheets having margins for covering the edge of the plaster body of the board, and, prior to folding said margins over the edge of the body, placing a separate fibrous edgmg strip within the board adjacent to the foldedmargins, and then folding said margins over the edge of the board and securing the same to said strip. 1

In testimony whereof I aflix my signature.

CLARENCE W. u'rzMAN.

ter body and facing sheets of fibrous material of greater width than the board body, and having their side edges folded together across the side edges of the board, the folded edges being supported and reinforced by strips of fibrous material connected thereto and to the body of one of the facing sheetsl 7.- The method of making protected-edge plaster board, which includes employing 

